It's more a matter of scale. Heavier bows tend to be thicker and longer.
The 5:8 is pretty much irrelevant as few ELBs are anywhere near that, much nearer 6:8 or 7:8
The warbows tend to be more squareish or roundish in section or like an inflated rectangle. Lighter bows especially Victorian ones tend to be a more semicircular belly and stiffer in the grip.
Del